Flushall adjustable flush valve with 3" flapper installs easily into most standard toilets. 750 gallon of water saved annually on each toilet installed. 40\% more flushing power using less water. Eco-friendly green flapper allows user to control water. Oversized 3" opening improves flush. No cut overflow tube adjusts from 8.5" to 13" for various height toilet tanks. You will need to install a new tank to bowl kit in conjunction with the Flushall flush valve with 3" flapper, (kit included). 1 year warranty, CUPC approved.